<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>websocket</title>
</head>
<body>

<input id="text" type="text"/>
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>


<script type="text/javascript">
    if (!'WebSocket' in window) {
        alert('当前浏览器不支持WebSocket 无法继续进行游戏，请更换浏览器或设备!')
    }

    let username;
    while (!username) {
        username = prompt("请输入你的游戏昵称:");
    }

    const websocket = new WebSocket("ws://localhost:3050/test/" + username);

    //连接发生错误的回调方法
    websocket.onerror = function () {
        setMessageInnerHTML("连接错误");
    };

    //连接成功建立的回调方法
    websocket.onopen = function (event) {
        setMessageInnerHTML("已连接");
    }

    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML("已收到消息:" + event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function () {
        setMessageInnerHTML("已断开");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += '<br>' + innerHTML;
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        const message = document.getElementById('text').value;
        setMessageInnerHTML("已发送消息:" + message)
        websocket.send(message);
    }
</script>
</body>
</html>